<!-- eslint-disable vue/require-v-for-key -->
<!--
 * User: CHT
 * Date: 2020/6/28
 * Time: 17:48
-->
<template>
  <div>
    <div>
      <el-form
        class="link-base-style-form"
        ref="linkBaseStyle"
        label-width="100px"
        @submit.native.prevent
        :model="linkBaseStyle"
      >
        <h4>linkBaseStyle (连线的样式定制)</h4>
        <el-row :gutter="10">
          <el-col :span="12">
            <el-form-item label="color">
              <el-color-picker v-model="linkBaseStyle.color" />
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="hover">
              <el-color-picker v-model="linkBaseStyle.hover" />
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="textColor">
              <el-color-picker v-model="linkBaseStyle.textColor" />
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="textHover">
              <el-color-picker v-model="linkBaseStyle.textHover" />
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="font">
              <el-select size="medium" v-model="linkBaseStyle.font">
                <el-option v-for="item in fontList" :key="item" :label="item" :value="item" />
              </el-select>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="dotted">
              <el-switch
                v-model="linkBaseStyle.dotted"
                active-color="#13ce66"
                inactive-color="#ff4949"
              />
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="lineDash">
              <el-select size="medium" style="width: 80px" v-model="linkBaseStyle.lineDash[0]">
                <el-option
                  v-for="item in [1, 2, 3, 4, 5, 6, 7, 8]"
                  :key="item"
                  :label="item"
                  :value="item"
                />
              </el-select>
              <el-select size="medium" style="width: 80px" v-model="linkBaseStyle.lineDash[1]">
                <el-option
                  v-for="item in [1, 2, 3, 4, 5, 6, 7, 8]"
                  :key="item"
                  :label="item"
                  :value="item"
                />
              </el-select>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="background">
              <el-color-picker v-model="linkBaseStyle.background" />
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
    </div>

    <div class="super-flow-demo1">
      <div class="node-container">
        <span
          class="node-item"
          v-for="item in nodeItemList"
          @mousedown="(evt) => nodeItemMouseDown(evt, item.value)"
        >
          {{ item.label }}
        </span>
      </div>
      <div class="flow-container" ref="flowContainer">
        <super-flow
          ref="superFlow"
          :graph-menu="graphMenu"
          :node-menu="nodeMenu"
          :link-menu="linkMenu"
          :link-base-style="linkBaseStyle"
          :link-style="linkStyle"
          :link-desc="linkDesc"
        >
          <template #node="{ meta }">
            <div @mouseup="nodeMouseUp" @click="nodeClick" class="flow-node ellipsis">
              {{ meta.name }}
            </div>
          </template>
        </super-flow>
      </div>
    </div>

    <el-dialog
      :title="drawerConf.title"
      v-model:visible="drawerConf.visible"
      :close-on-click-modal="false"
      width="500px"
    >
      <el-form
        @keyup.native.enter="settingSubmit"
        @submit.native.prevent
        v-show="drawerConf.type === drawerType.node"
        ref="nodeSetting"
        :model="nodeSetting"
      >
        <el-form-item label="节点名称" prop="name">
          <el-input v-model="nodeSetting.name" placeholder="请输入节点名称" maxlength="30" />
        </el-form-item>
        <el-form-item label="节点描述" prop="desc">
          <el-input v-model="nodeSetting.desc" placeholder="请输入节点描述" maxlength="30" />
        </el-form-item>
      </el-form>
      <el-form
        @keyup.native.enter="settingSubmit"
        @submit.native.prevent
        v-show="drawerConf.type === drawerType.link"
        ref="linkSetting"
        :model="linkSetting"
      >
        <el-form-item label="连线描述" prop="desc">
          <el-input v-model="linkSetting.desc" placeholder="请输入连线描述" />
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="drawerConf.cancel"> 取 消 </el-button>
        <el-button type="primary" @click="settingSubmit"> 确 定 </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  const drawerType = {
    node: 0,
    link: 1,
  }

  export default {
    data() {
      return {
        drawerType,
        drawerConf: {
          title: '',
          visible: false,
          type: null,
          info: null,
          open: (type, info) => {
            const conf = this.drawerConf
            conf.visible = true
            conf.type = type
            conf.info = info
            if (conf.type === drawerType.node) {
              conf.title = '节点'
              if (this.$refs.nodeSetting) this.$refs.nodeSetting.resetFields()
              this.$set(this.nodeSetting, 'name', info.meta.name)
              this.$set(this.nodeSetting, 'desc', info.meta.desc)
            } else {
              conf.title = '连线'
              if (this.$refs.linkSetting) this.$refs.linkSetting.resetFields()
              this.$set(this.linkSetting, 'desc', info.meta ? info.meta.desc : '')
            }
          },
          cancel: () => {
            this.drawerConf.visible = false
            if (this.drawerConf.type === drawerType.node) {
              this.$refs.nodeSetting.clearValidate()
            } else {
              this.$refs.linkSetting.clearValidate()
            }
          },
        },
        linkSetting: {
          desc: '',
        },
        nodeSetting: {
          name: '',
          desc: '',
        },

        dragConf: {
          isDown: false,
          isMove: false,
          offsetTop: 0,
          offsetLeft: 0,
          clientX: 0,
          clientY: 0,
          ele: null,
          info: null,
        },
        nodeItemList: [
          {
            label: '节点1',
            value: () => ({
              width: 120,
              height: 40,
              meta: {
                label: '1',
                name: '1',
              },
            }),
          },
          {
            label: '节点2',
            value: () => ({
              width: 120,
              height: 40,
              meta: {
                label: '2',
                name: '2',
              },
            }),
          },
          {
            label: '节点3',
            value: () => ({
              width: 120,
              height: 40,
              meta: {
                label: '3',
                name: '3',
              },
            }),
          },
          {
            label: '节点4',
            value: () => ({
              width: 120,
              height: 40,
              meta: {
                label: '4',
                name: '4',
              },
            }),
          },
        ],

        graphMenu: [
          [
            {
              // 选项 label
              label: '节点1',
              // 选项是否禁用
              disable(graph) {
                return !!graph.nodeList.find((node) => node.meta.label === '1')
              },
              // 选项选中后回调函数
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '1',
                    name: '1',
                  },
                })
              },
            },
            {
              label: '节点2',
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '2',
                    name: '2',
                  },
                })
              },
            },
            {
              label: '节点3',
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '3',
                    name: '3',
                  },
                })
              },
            },
          ],
          [
            {
              label: '节点4',
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '4',
                    name: '4',
                  },
                })
              },
            },
          ],
          [
            {
              label: '全选',
              selected: (graph) => {
                graph.selectAll()
              },
            },
          ],
        ],
        nodeMenu: [
          [
            {
              label: '删除',
              selected: (node) => {
                node.remove()
              },
            },
            {
              label: '编辑',
              selected: (node) => {
                this.drawerConf.open(drawerType.node, node)
              },
            },
          ],
        ],
        linkMenu: [
          [
            {
              label: '删除',
              selected: (link) => {
                link.remove()
              },
            },
            {
              label: '编辑',
              selected: (link) => {
                this.drawerConf.open(drawerType.link, link)
              },
            },
          ],
        ],

        linkBaseStyle: {
          color: '#666666', // line 颜色
          hover: '#FF0000', // line hover 的颜色
          textColor: '#666666', // line 描述文字颜色
          textHover: '#FF0000', // line 描述文字 hover 颜色
          font: '14px Arial', // line 描述文字 字体设置 参考 canvas font
          dotted: false, // 是否是虚线
          lineDash: [4, 4], // 虚线时生效
          background: 'rgba(255,255,255,0.6)', // 描述文字背景色
        },
        fontList: ['14px Arial', 'italic small-caps bold 12px arial'],
      }
    },
    mounted() {
      document.addEventListener('mousemove', this.docMousemove)
      document.addEventListener('mouseup', this.docMouseup)
      this.$once('hook:beforeDestroy', () => {
        document.removeEventListener('mousemove', this.docMousemove)
        document.removeEventListener('mouseup', this.docMouseup)
      })
    },
    methods: {
      flowNodeClick(meta) {
        console.log(this.$refs.superFlow.graph)
      },
      linkStyle(link) {
        if (link.meta && link.meta.desc === '1') {
          return {
            color: 'red',
            hover: '#FF00FF',
            dotted: true,
          }
        } else {
          return {}
        }
      },
      linkDesc(link) {
        return link.meta ? link.meta.desc : ''
      },
      settingSubmit() {
        const conf = this.drawerConf
        if (this.drawerConf.type === drawerType.node) {
          if (!conf.info.meta) conf.info.meta = {}
          Object.keys(this.nodeSetting).forEach((key) => {
            this.$set(conf.info.meta, key, this.nodeSetting[key])
          })
          this.$refs.nodeSetting.resetFields()
        } else {
          if (!conf.info.meta) conf.info.meta = {}
          Object.keys(this.linkSetting).forEach((key) => {
            this.$set(conf.info.meta, key, this.linkSetting[key])
          })
          this.$refs.linkSetting.resetFields()
        }
        conf.visible = false
      },
      nodeMouseUp(evt) {
        evt.preventDefault()
      },
      nodeClick() {
        console.log(arguments)
      },
      docMousemove({ clientX, clientY }) {
        const conf = this.dragConf

        if (conf.isMove) {
          conf.ele.style.top = clientY - conf.offsetTop + 'px'
          conf.ele.style.left = clientX - conf.offsetLeft + 'px'
        } else if (conf.isDown) {
          // 鼠标移动量大于 5 时 移动状态生效
          conf.isMove = Math.abs(clientX - conf.clientX) > 5 || Math.abs(clientY - conf.clientY) > 5
        }
      },
      docMouseup({ clientX, clientY }) {
        const conf = this.dragConf
        conf.isDown = false

        if (conf.isMove) {
          const { top, right, bottom, left } = this.$refs.flowContainer.getBoundingClientRect()

          // 判断鼠标是否进入 flow container
          if (clientX > left && clientX < right && clientY > top && clientY < bottom) {
            // 获取拖动元素左上角相对 super flow 区域原点坐标
            const coordinate = this.$refs.superFlow.getMouseCoordinate(
              clientX - conf.offsetLeft,
              clientY - conf.offsetTop,
            )

            // 添加节点
            this.$refs.superFlow.addNode({
              coordinate,
              ...conf.info,
            })
          }

          conf.isMove = false
        }

        if (conf.ele) {
          conf.ele.remove()
          conf.ele = null
        }
      },
      nodeItemMouseDown(evt, infoFun) {
        const { clientX, clientY, currentTarget } = evt

        const { top, left } = evt.currentTarget.getBoundingClientRect()

        const conf = this.dragConf
        const ele = currentTarget.cloneNode(true)

        Object.assign(this.dragConf, {
          offsetLeft: clientX - left,
          offsetTop: clientY - top,
          clientX: clientX,
          clientY: clientY,
          info: infoFun(),
          ele,
          isDown: true,
        })

        ele.style.position = 'fixed'
        ele.style.margin = '0'
        ele.style.top = clientY - conf.offsetTop + 'px'
        ele.style.left = clientX - conf.offsetLeft + 'px'

        this.$el.appendChild(this.dragConf.ele)
      },
    },
  }
</script>

<style lang="less">
  .ellipsis {
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    word-wrap: break-word;
  }

  .link-base-style-form {
    .el-form-item {
      margin-bottom: 12px;
    }

    padding-bottom: 20px;
    border-bottom: 1px solid #dcdcdc;
  }

  .super-flow-demo1 {
    margin-top: 20px;
    width: 100%;
    height: 800px;
    background-color: #f5f5f5;
    @list-width: 200px;

    > .node-container {
      width: @list-width;
      float: left;
      height: 100%;
      text-align: center;
      background-color: #ffffff;
    }

    > .flow-container {
      width: calc(100% - @list-width);
      float: left;
      height: 100%;
      overflow: hidden;
    }

    .super-flow__node {
      .flow-node {
        box-sizing: border-box;
        width: 100%;
        height: 100%;
        line-height: 40px;
        padding: 0 6px;
        font-size: 12px;
      }
    }
  }

  .node-item {
    @node-item-height: 30px;

    font-size: 14px;
    display: inline-block;
    height: @node-item-height;
    width: 120px;
    margin-top: 20px;
    background-color: #ffffff;
    line-height: @node-item-height;
    box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    user-select: none;
    text-align: center;
    z-index: 6;

    &:hover {
      box-shadow: 1px 1px 8px rgba(0, 0, 0, 0.4);
    }
  }
</style>
